AMS Tracker Thermal Control System (TTCS)
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AMS Tracker Thermal Control System (TTCS) Phase II Safety Presentation SRII meeting, 21 May 2007, Houston Johannes van Es/NLR PowerPoint PPT Presentation


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AMS Tracker Thermal Control System (TTCS) Phase II Safety Presentation SRII meeting, 21 May 2007, Houston Johannes van Es/NLR. Contents. TTCS Objective TTCS System Overview TTCS Components TTCS operational results. TTCS System Overview. 144 Watts. TTCS Objective .

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AMS Tracker Thermal Control System (TTCS) Phase II Safety Presentation SRII meeting, 21 May 2007, Houston Johannes van Es/NLR

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AMS Tracker Thermal Control System (TTCS)

Phase II Safety Presentation SRII meeting, 21 May 2007, Houston

Johannes van Es/NLR


Contents

  • TTCS Objective

  • TTCS System Overview

  • TTCS Components

  • TTCS operational results


TTCS System Overview

144 Watts


TTCS Objective

  • Provide accurate temperature control of AMS Tracker front-end electronics

  • Keep heat away from the Cryogenic System and Magnet


TTCS Overview

  • Two independent redundant CO2 two-phase pumped loops

    • Primary loop

      • TTCB Box on Port side

      • Condenser at Wake and RAM radiator (also port side)

    • Secondary Loop

      • TTCB Box on Starboard side

      • Condenser at Wake and RAM radiator (also starboard side)

    • TTCE Tracker Thermal Control Electronics located at the wake radiator bottom next to PDS


Tracker radiators

TTCS Condensers are attached to the Tracker radiators

Tracker

TTCS box envelopes

(locations)


Box components

  • All components except the evaporator and the condenser are located in the TTCS-box

    • one primary box (port side)

    • one secondary box (starboard side)

  • Containing

    • Pumps (2x)

    • Accumulator with Peltier heat exchanger

    • Heat Exchanger with start-up heaters

    • Absolute pressure sensors (2x)

    • Differential pressure sensors (2x)

    • Cold orbit heater (1 unit)

    • Pre-heaters (2x)

    • Thermal switches (20x)

    • Pt1000 temperature sensors (30x)

    • Dallas temperature sensors (22x)


Tracker Thermal Control System

Evaporator (overview)

192 Hybrids

each producing 0.75 Watts of heat

(144 W total)


Tracker Thermal Control System

Evaporator (overview)


Tracker Thermal Control System

Evaporator tubing upper inner and outer ring

Connection to transport tubing


Tracker Thermal Control System

Welding close to TTCS boxes

TTCS Boxes


TTCS Primary Box location (wake port side)

weld locations indocated with arrows


Tracker Thermal Control System

TTCS Condenser locations


  • TTCS Primary loop Wake Condenser (WAKE port side)

  • Each system has two condensers one on Wake side and one on RAM side


STARBOARD side

RAM

PORT side

WAKE

Primary loop TTCS tubing on port side


STARBOARD side

RAM

PORT side

WAKE

Secondary loop TTCS tubing on starboard side


TTCS System summary box components

Each independent loop includes the following components the loop box:

  • 2 redundant pumps

  • 1 Accumulator to

    • accommodate liquid in case of two-phase operation and to allow for temperature-volume changes

    • control the evaporation temperature in the evaporator by control heaters, Peltier elements and emergency heaters

  • Heat Exchanger to use the evaporator heat to pre-heat the subcooled CO2 fluid (saves power)

  • 2 Pre-heaters to heat both evaporator branches to Tsaturation


TTCS System summary box components

  • Absolute pressure sensors to monitor the pressure

  • Differential pressure sensors to monitor the mass flow

  • Cold orbit heater used to increase energy content of the CO2 two-phase flow. To avoid too low temperatures in cold orbit condition operation

  • Start-up heater to heat the liquid flow to the evaporator from -40C to -20C to keep front-end electronics in their temperature window


TTCS Box

accumulator

Abs. P-sensor

Cold orbit heater

Heat exchanger

Swagelok weld couplings

Diff. P-sensor


TTCS Box

accumulator

Abs. P-sensor

Cold orbit heater

Heat exchanger

Diff. P-sensor

Swagelok weld couplings

Cover with ext. connectors


TTCS Box

Pumps

Cold orbit heater

Pump Electronics box


Pump

Pump is an adapted Martian Exploration rover pump by PDT

  • Centrifugal pump

  • Successful CDR in September 2006

Pump Controller

EM Pump


Accumulator

Two-phase accumulator

  • Heat pipe to heat the accumulator in the centre of the accumulator

    • Peltiers to cool the accumulator at the mantle the Peltier cold side connected to the liquid line from the condensers


Accumulator

liquid inlet pipe with mesh

HP cross section


Accumulator

  • Mesh Design

  • Spoke design to transport the liquid to the HP

  • Wick Design Fan Mesh to keep the CO2 around the liquid inlet to supply the CO2-loop with liquid

Spoke mesh design

fan mesh design and liquid inlet

HP cross section

Spoke and Fan mesh design

Fan mesh detail


Heat exchanger Assembly

Heat Exchanger QM/FM


HX QM/FM Assembly

  • Heat Exchanger exists of:

    • 36 stacked heat exchanger plates (Inconel 625)

    • Two container parts (Inconel 625) with machined tube ends

      • 2 Diff. Pressure Sensor at ones side

      • 4 connections to the loop at the other side

    • 2 heater wires at the mantle

    • 2 brackets to connect to the bottom plate

    • 2 clips to connect HX to the brackets

    • 6 Thermal Switches (integrated later) to avoid overheating the TTCS system


HX QM/FM Assembly


Pre-heater


Cold-orbit heater


TTCS Breadboard Testing Results


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